ostentate vs flaunt

ostentate is not a noun while flaunt is a noun.

Word	Noun	Adjective	Verb	Adverb
ostentate	No	No	Yes	No
flaunt	Yes	No	Yes	No

As verbs, ostentate and flaunt are synonyms defined as:

ostentate and flaunt: display proudly; act ostentatiously or pretentiously

Other synonyms of ostentate include flash, show off, swank.

ostentate (noun)	flaunt (noun)
	the act of displaying something ostentatiously

ostentate (verb)	flaunt (verb)
display proudly; act ostentatiously or pretentiously	display proudly; act ostentatiously or pretentiously